2012 JH 67
|
Asteroid 2012 JH 67 |
|
|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type |
RKBO 1: 2 , "Distant Object" |
| Major semi-axis | 48,089 AU |
| eccentricity | 0.273 |
| Perihelion - aphelion | 34.978 AU - 61.2 AU |
| Inclination of the orbit plane | 6.6 ° |
| Length of the ascending node | 329.3 ° |
| Argument of the periapsis | 165 ° |
| Time of passage of the perihelion | June 8, 1956 |
| Sidereal period | 333 a 5.9 M. |
| Mean orbital velocity | 4.260 km / s |
| Physical Properties | |
| Medium diameter | approx. 373 km |
| Albedo | 0.08-0.09 |
| Absolute brightness | 5.5 - 5.6 mag |
| history | |
| Explorer |
Pan-STARRS : B. Gibson T. Goggia N. Primak A. Schultz M. Willman |
| Date of discovery | May 14, 2012 |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
2012 JH 67 is a large trans-Neptunian object in the Kuiper belt , which is classified as a resonant KBO ( Twotino ) in terms of railway dynamics . Due to its size, the asteroid may be one of the dwarf planet candidates .
discovery
2012 JH 67 was discovered on May 14, 2012 by a team of astronomers consisting of B. Gibson, T. Goggia, N. Primak, A. Schultz and M. Willman with the 1.8 m Pan-STARRS telescope (PS1 ) discovered at Haleakalā Observatory ( Maui ). The discovery was announced on July 26, 2016.
After its discovery, in 2012 JH 67 could be identified on photos up to April 19, 2010, which were also taken as part of the Pan-STARRS program, and thus its observation period was extended by four years in order to calculate its orbit more precisely. Since then, the planetoid has been observed by the Pan-STARRS and the Cerro Tololo observatory . In December 2018, there were a total of 74 observations over a period of 9 years. The last observation so far was carried out again in May 2018 at the Pan-STARRS telescope (PS1). (As of March 14, 2019)
properties
Orbit
2012 JH 67 orbits the sun in 333.49 years in an elliptical orbit between 34.98 AU and 61.20 AU from its center. The orbit eccentricity is 0.272, the orbit is 6.62 ° inclined to the ecliptic . The planetoid is currently 46.56 AU from the Sun. He last passed through perihelion in 1956, so the next perihelion should take place in 2289.
Marc Buie ( DES ) classifies the planetoid as Twotino (RKBO 1: 2), while the Minor Planet Center does not have a specific classification; the latter classifies it as a non-SDO and generally as a “distant object” . The Johnston's Archive lists it as "other TNO" , which means that it should not be a Cubewano or Resonantes KBO .
size
A diameter of 373 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.6 m . Based on this diameter, the total area is around 437,000 km². The apparent magnitude of 2012 JH 67 is 22.26 m .
Since it is conceivable that 2012 JH 67 will be in hydrostatic equilibrium due to its size and could thus be largely round, it may meet the criteria for classification as a dwarf planet . Mike Brown expects that it is at 2012 JH 67 to perhaps is a dwarf planet.
| year | Dimensions km | source |
|---|---|---|
| 2018 | 404.0 | Johnston |
| 2018 | 373.0 | Brown |
| The most precise determination is marked in bold . | ||
See also
- List of trans-Neptunian objects
- List of dwarf planets of the solar system
- List of asteroids
- List of moons from asteroids
Web links
- How many dwarf planets are there in the outer solar system? Current list of the largest TNOs from Mike Brown
- Free the dwarf planets! Mike Brown's column on the IAU and the dwarf planets regarding their classifications (23 August 2011)
Individual evidence
- ^ A b Marc W. Buie : Orbit Fit and Astrometric record for 12JH67 . SwRI (Space Science Department). Retrieved March 14, 2019.
- ↑ a b c 2012 JH67 at the IAU Minor Planet Center (English) Retrieved on March 14, 2019.
- ↑ v ≈ π * a / period (1 + sqrt (1-e²))
- ↑ MPC : MPEC 2016-0363: 2012 JH67 . IAU . July 26, 2016. Accessed March 14, 2019.
- ↑ 2012 JH67 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 14, 2019.
- ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 14, 2019.
- ^ A b Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 14, 2019.
- ↑ 2012 JH67 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 14, 2019.